CAR Blueprint Reading & Interpretation 3

Question 1

On a dryer wiring diagram, terminals labeled L1 and L2 represent:

Accepted Answer

The two 120V legs of a 240V supply

Answer

L1 and L2 are the two hot legs of a 240V split-phase supply, each carrying 120V to neutral.

Question 2

In a blueprint title block, the 'revision history' section is important during recycling assessment because it:

Accepted Answer

Records design changes that may affect component compatibility

Answer

The revision history documents changes to the design, which is critical when sourcing replacement parts or assessing material composition.

Question 3

A schematic shows a component symbol with two parallel horizontal lines of unequal length. This represents a:

Accepted Answer

Battery or DC power source

Answer

Two parallel lines of unequal length is the standard schematic symbol for a battery or DC power source, with the longer line being the positive terminal.

Question 4

When interpreting a heat pump blueprint, the reversing valve is identified because it:

Accepted Answer

Has four refrigerant line connections shown on the diagram

Answer

A reversing (four-way) valve has four refrigerant ports — suction, discharge, and two to the indoor/outdoor coils — which distinguishes it on diagrams.

Question 5

A CAR technician reads a blueprint scale of 1:10. If a component measures 3 cm on the drawing, what is its actual size?

Accepted Answer

30 cm

Answer

At a 1:10 scale, the actual object is 10 times larger than the drawing, so 3 cm × 10 = 30 cm.

(CAR) Certified Appliance Recycler Practice Test

(CAR) Certified Appliance Recycler Practice Test

CAR Blueprint Reading & Interpretation 3